Marines with 2nd Marine Logistics Group take off their protective suits after completing a field survey with the AN/PDR-77, a device that detects and measures radiation, during a training exercise aboard Camp Lejeune, , Oct. 17, 2012. Chemical, biological, radiological and nuclear defense specialists instructed the troops on how to use the equipment to detect and measure simulated radiation in contaminated situations throughout a four-day course. Marines learn how to detect invisible threat during course 121017-M-AR522-072

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Photo credit: © PJF Military Collection / Alamy / Afripics
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